JPH04197998A - Vehicle for work at a height - Google Patents

Abstract

PURPOSE:To stabilize body of a vehicle for work at a height by installing, in a freely rising and falling manner, a boom, which expands and contracts with a gondola equipped on the upper end, on the protruding end of a supporting boom protruding in the longitudinal direction of the body and made freely rotatable in the vertical direction, and also installing a wheel on the ground portion of the boom. CONSTITUTION:A cabin (b) and a driving portion (c) are mounted on a body 2 traveling on a crawler 1. A frame (f) fitted on one end of the body 2 is rotated around a connecting shaft 61 and is raised and lowered by means of a hydraulic cylinder 62 secured to a bracket 60. A multi-section (drawing shows three sections) bottom 3, which is made to freely rise and fall and expand and contract, is installed through a connecting shaft 63 at the end of the frame (f). A working gondola 4 is installed on the upper most end of the boom 3 and rises and falls as indicated by an arrow B by means of a rod 70 of a hydraulic cylinder 7 and links 71, 72. Also a wheel 5 is provided on the bottom of the ground portion of the boom 3. Thus stabilization of a small body can be improved as it is and the operating radius l1 can be expanded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a gondola that supports a gondola on which a worker rides on the upper end in order to carry out work at high places such as construction of electric wires strung on utility poles. The present invention relates to improvements to a vehicle for working at high altitudes, which is constructed by mounting a telescopic boom on the vehicle body.

Conventional technology 1 The above-mentioned aerial work vehicle A has the following conventional techniques:
Usually, as shown in FIG. 1, a vehicle body a that freely travels by a traveling device 1 is equipped with an extendable boom 3, which is a combination of hydraulic cylinders in multiple stages, on a swivel base 2 provided on the upper surface of the vehicle body a. The gondola 4 on which the worker rides is mounted on the upper end of the boom 3. Then, when the worker gets into the gondola 4, the driver, who is in the cabin mounted on the swivel base 2, controls the hydraulic system.
The telescopic boom 3 is extended to push the gondola 4 higher, and the boom 3 is tilted to a desired inclination angle by the control of the hydraulic cylinder 30 that raises and rotates the boom 3. The gondola 4 is moved so that it is positioned at the desired work location, and the worker inside the gondola 4 uses it to perform a predetermined work.

[Problems to be Solved by the Invention] The aerial work vehicle A of this form has, for example, an obstacle such as a rotator H that obstructs the movement of the vehicle body a, as shown in FIG. 1, in front of the work place. If there is a problem and it is not possible to bring car body a below the work area, move car body a
is parked at a distant place, the boom 3 is tilted as shown in Fig. 1, and the gondola 4 supported on the upper end of the boom 3 is moved over the building H and closer to the work place.

At this time, the vehicle body a must be supported so that the boom 3 does not fall over.

By the way, when the boom 3 is tilted and the gondola 4 supported at the upper end thereof is extended to a position away from the car body a, the conditions under which the car body a does not fall are as shown in FIG. The support point of car a is P, the distance from this support point P to the perpendicular to the center of weight of gondola 4 is 2, the distance from the center of weight O of car body a to the support point P of car body a is 1, and Letting the weight of a be Wl, the product of the distance iL2 and the weight W2 of the gondola 4, 2×W2, is the distance fL
The product of 1 and the weight Wl of the vehicle body a is equal to or smaller than IXWI, that is, J12XW2≦u
It is necessary that there be a certain relationship lXWl.

From this, in the aerial work vehicle A, it is possible to increase the distance 12, which is the overhang length of the gondola 4, and to increase the weight W2 of the gondola 4 so that the number of workers inside the gondola 4 can be increased. For the above ff1lxWl
However, since it is difficult to increase the distance ff1l, which is limited by the size of the vehicle body a, a weight w is mounted on the vehicle body a to increase the weight Wl. It is covered by this.

For this reason, in a small vehicle where the distance Ill on the vehicle body side is small and there are restrictions on using a large way (W), this overhang length cannot be made large. A problem arises that makes it impossible to increase the number.

The present invention was made to solve this problem, and even if a small vehicle body a with a light weight Wl is used,
The distance 2, which is the overhang length of the gondola 4 supported on the upper end of the telescopic boom 3, can be increased, and the gondola 4 can be
The object of the present invention is to provide a new means for obtaining an aerial work vehicle that allows for an increase in the weight W2 of the gondola 4, thereby increasing the number of workers who can board the gondola 4. .

[Means for Solving the Problems] In the present invention, as a means for achieving this object, a support frame f that protrudes in the longitudinal direction is mounted on the vehicle body a so as to be rotatable up and down, its supporting frame f
An extendable boom 3, which supports a gondola 4 on which employees board the upper end, is mounted on the protruding end of the boom 3 so as to be rotatable up and down.
This is an elevated work vehicle in which wheels 5 are mounted on the lower surface of the base end of the boom 3.

[Function] According to the means of the present invention, by increasing the length of the support frame f that supports the telescopic boom 3 so as to be rotatable up and down, the wheels provided at the base end of the telescopic boom 3, which is the support point P, can be increased. 5
Since the distance if between the position of body a and the center of weight O of vehicle body a can be increased, the value of itxwt can be changed to
can be made larger without increasing the weight of the gondola 4, making the car body a lighter and smaller while stably holding the car body a so that it does not fall over, increasing the value of the weight W2 of the gondola 4 and the value of the distance 12 which becomes the overhang length. allows for an increase in

[Example] Next, an example will be described in detail with reference to the drawings. In addition, the drawing code is
The same reference numerals shall be used for components having the same effect as those of the previous means.

FIG. 2 is a side view of the aerial work vehicle A that can carry out the present invention in a working state. In the figure, a is the vehicle body, f is the support frame, 3 is an extendable boom, 4 is a gondola, and 5 is a wheel. do.

The vehicle body a is a normal one that runs on a traveling device 1 consisting of a crawler and has a swivel base 2 on the top side so that it can rotate freely. b, and a drive section C in the form of a machine casing that can house a prime mover, a hydraulic system, etc.

The support frame f is a member that substantially supports the telescopic boom 3, and is formed in the shape of a long arm in the front and rear, the base end of which constitutes the frame of the vehicle body a. It is connected to a mounting bracket 60 installed at the front end of the above-mentioned swivel base 2 so as to freely rotate up and down about a connecting shaft 61.

Then, the lower surface side of the support frame f and the bracket 6
The vertical movement about the connecting shaft 61 is caused by the expansion and contraction of the hydraulic cylinder 62, which is suspended between the connecting shaft 61 and the connecting shaft 61. Further, by operating a hydraulic cylinder (not shown) installed between the bracket 60 and the vehicle body a, the bracket 60 is rotated left and right, so that the support frame f is rotated left and right. It is.

The telescoping boom 3 is a normal one with hydraulic cylinders stacked in three stages, and a free wheel 5 is installed below the base end of the boom 3.
The front end of the support frame f is connected to the side surface of the base end of the boom 3 so as to be rotatable back and forth about the connection shaft 63, and the upper surface of the support frame f It is connected to a rod 70 for moving in and out of a hydraulic cylinder 7 provided on the side via link rods 71 and 72, and by the expansion and contraction of this hydraulic cylinder 7, a desired position is moved relative to the support frame f at the center of the connection shaft 63. Becomes inclined to the inclination angle,
In addition, a hydraulic cylinder 6 provided on the lower surface side of the support frame f
2, the support frame f rotates upward about the connecting shaft 61, thereby moving upward while being supported by the support frame f.

The gondola 4 supported on the upper end of the telescopic boom 3 is a normal type that can accommodate several workers, and is supported so as to maintain a desired angle with respect to the boom 3. An operating device 40 is provided to remotely control the inclination angle with respect to f.

The embodiment device constructed in this manner operates as follows.

As shown in FIG. 2, the support frame f is held in a position protruding forward of the vehicle body a, and a telescopic boom 3 that can be supported at the tip of the support frame f is mounted on the lower surface of its base end. The installed wheels 5 are in a state of being in contact with the ground. In this state, the aerial work vehicle A has a boom 3 that extends and contracts.
The support point P that supports the load is the position of the wheel 5 installed below the base end of the boom 3. Therefore, the distance it from the weight center 0 of the vehicle body a to the support point P is approximately the support frame f
becomes longer by the length of . As a result, even if the weight Wl of the car body a itself is light, and even if the longitudinal length of the car body a is short, the distance 11 from the center of weight O of the car body a to the support point P and the distance 11 of the car body a IXW is the product of weight W1
This means that the value of I can be increased.

In this state, if the hydraulic cylinder 7 provided on the upper surface of the support frame f is extended, the boom 3 supporting the gondola 4 will be centered on the connection shaft 63 with the support frame f.
As shown by the chain line A in FIG. 2, the gondola 4 is tilted and rotated forward, so that the gondola 4 is extended forward. At this time, the distance 2 from the intersection of the perpendicular from the center of the weight W2 of the gondola 4 and the ground surface GL to the grounding point of the wheel 5, which is the support point P, is determined by the distance it on the vehicle body side described above. By being there,
It becomes relatively small with respect to this distance 11.

Ensure that the condition 2XW2≦ff11XW1 is maintained.

Next, when the work is finished, tilt the boom 3 backwards and press the 35th! Then, the support frame f is rotated upward and moved to the desired position as shown in FIG. 4.

C Effects of the Invention] As explained above, in the aerial work vehicle according to the present invention, a support frame f that projects in the front-rear direction is mounted on the vehicle body a so as to be vertically rotatable, and the projecting end of the support frame f is A telescopic boom 3 supporting a gondola 4 at its upper end is supported so as to be rotatable up and down, and wheels 5 are installed below the base end of the boom 3. When the wheels 5 touch the ground, the boom 3 By increasing the length of the support frame f that supports this telescoping boom 3 so as to be able to rotate up and down, the wheels provided at the base end of the telescoping boom 3, which is the support point P, can be installed. Since the distance intersection 1 between the position 5 and the center of weight O of the vehicle body a can be increased, the value of itxwt can be increased without increasing the longitudinal length of the vehicle body a and the weight Wl of the vehicle body a. The weight W2 of the gondola 4 and the distance IL2 corresponding to the overhang length can be increased by stably holding the vehicle body a so as not to overturn while making the gondola lightweight and compact.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional aerial work vehicle, FIG. 2 is a side view of a vehicle for aerial work in which the present invention can be implemented, and FIGS. 3 and 4 are explanatory diagrams of the same operation. Explanation of drawing symbols A...Aerial work vehicle H...Connection P...Support point 0...Center of weight GL...Ground surface
a...Vehicle body b...Cabin C...
・Drive part f...Support frame IL@12...
Distance Wl-W2... Weight W... Weighted
・Traveling device 2...Swivel base 3...Boom
30... Hydraulic cylinder 4... Gondola
40... Operating device 5... Wheel
60...Mounting bracket 61...Connection shaft
62...Hydraulic cylinder 63...Connection shaft
7... Hydraulic cylinder 70... Rod 71
・72...Link rod patent applicant Honeyx Industrial Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) Support frame f protruding from the vehicle body a in the longitudinal direction
is mounted so as to be freely rotatable up and down, and an extendable boom 3 supporting a gondola 4 on the upper end of which a worker rides is mounted on the protruding end of the support frame f so as to be rotatable up and down. An aerial work vehicle having wheels 5 mounted on the bottom side of the base end of a boom 3.